Caldo Verde (Portuguese: "green broth") is the national soup of Portugal — a thick, earthy soup made from potato puréed to thicken the broth, thinly sliced kale or collard greens (couve galega), sliced chouriço (a smoked paprika-cured pork sausage), olive oil, and water or stock. It is a simple soup with few ingredients but a complex staining profile. The potato is cooked until very soft and partially crushed or puréed into the broth — unlike ribollita (which is thickened with bread) or chowder (thickened with cream), Caldo Verde's thickness comes entirely from dissolved potato starch. This creates a concentrated starch paste at the contact zone rather than a liquid stain. The chouriço contributes two key staining elements: a vivid orange-red colour from paprika (capsanthin) and a smoked pork fat that distributes through the broth during cooking. The olive oil drizzled at service adds a third fat source. The kale is shredded into very thin ribbons (1–2 mm wide) that scatter widely on impact and embed readily between carpet fibres.
Caldo Verde cleaning steps
- Remove chouriço slices and any whole kale ribbons by hand. Vacuum to capture the fine kale shreds that scatter across the spill area. Kale ribbons are thin and dark — they can be hard to see against a broth-dampened carpet.
- Blot the thick soup — the puréed potato base does not spread rapidly but leaves a concentrated stain zone.
- Apply cornflour for the chouriço rendered pork fat and the olive oil. Two rounds of 20 minutes each.
- Apply cold water twice and blot between applications — two rinse cycles to dilute and loosen the potato starch purée before the enzyme step.
- Apply dish soap solution and blot.
- Apply enzyme cleaner for 25 minutes — for the potato starch purée (amylase, extended dwell for the concentrated potato starch), chouriço pork protein (protease), and kale plant compounds.
- Rinse with cold water and blot dry.
- Apply hydrogen peroxide (3%) for the chouriço paprika colour (capsanthin, the orange-red pigment from the paprika used to cure the chouriço). One round for a lightly coloured broth; two rounds if the chouriço was deeply pigmented or a large amount was used.
- Apply baking soda for 2–3 hours (not overnight in most cases) for the chouriço smoke compounds. Chouriço smoke is less pungent than bacon — a shorter baking soda treatment usually suffices.
Kale ribbons — vacuum before wetting, not after
The kale in Caldo Verde is sliced into very thin ribbons (1–2 mm wide, several centimetres long) that are designed to cook quickly and remain tender. When Caldo Verde spills, these thin kale ribbons scatter across the carpet and the surrounding floor area well beyond the main stain zone — their light weight and flat shape allows them to travel far on impact. Vacuum the full area including 20–30 cm beyond the visible stain before applying any liquid. A kale ribbon that is wetted during treatment clings to carpet fibres and becomes harder to extract than a dry ribbon. The order is: hand-pick the chouriço slices first (they are visible and discrete), then vacuum the whole area to collect the kale ribbons, then begin liquid treatment.
Potato starch or chouriço paprika colour from Caldo Verde persisting in carpet?
Concentrated potato starch and paprika pigment that have penetrated carpet pile may need professional hot-water extraction for complete resolution.
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Frequently asked
The Caldo Verde used Spanish chorizo rather than Portuguese chouriço. Spanish chorizo has a higher paprika concentration and a firmer, drier texture. Does Spanish chorizo stain differently from Portuguese chouriço?
Spanish chorizo has a higher paprika-to-pork ratio than Portuguese chouriço — the drier, firmer texture means the paprika pigment is more concentrated per slice. When Spanish chorizo falls on carpet, the contact stain from the paprika oil (the paprika oil coat on the surface of the chorizo) can be more intense at the contact point than a chouriço slice would leave. Apply one additional targeted hydrogen peroxide round to the chorizo contact points specifically (where the slice sat against the carpet) after treating the general broth zone. The smoked fat from Spanish chorizo is similar in composition to chouriço — two cornflour rounds for the general soup area remain correct. Spanish chorizo slices are also firmer and easier to pick up cleanly without crumbling.
The Caldo Verde was blended completely smooth — a modern restaurant version where the potato and kale are fully puréed using an immersion blender, giving a vivid green smooth soup rather than the traditional chunky version. Does fully puréed Caldo Verde behave differently?
A fully puréed, smooth Caldo Verde is uniformly green (from the kale chlorophyll distributed throughout the blended soup) and has no discrete pieces to remove before wetting. The physical removal step is skipped. The staining implications: the green chlorophyll from the kale is now distributed throughout the entire spill zone rather than being concentrated at kale ribbon contact points. This means the hydrogen peroxide step must cover the full spill area for the chlorophyll colour (rather than just the kale contact spots). Apply two hydrogen peroxide rounds across the full spill zone for a blended green Caldo Verde. The potato starch concentration is the same as for the traditional version. The chouriço (if sliced and added at serving rather than blended in) would still be discrete pieces for removal.
Caldo Verde is traditionally served in a clay pot (cataplana or terracotta bowl). The hot terracotta bowl sat on the carpet briefly before being lifted, and the residual heat and any moisture on the bottom left a ring mark on the carpet. How do I treat a terracotta pot ring mark?
A terracotta pot ring mark on carpet combines two potential staining elements: the heat from the hot clay (which can set any liquid at the base of the pot into the fibres — particularly if the pot had soup residue on its base) and the mineral content of the terracotta itself (if the unglazed clay base contacted the carpet directly, fine terracotta dust or mineral deposits can remain). For the heat-set soup ring: the same treatment sequence as for the soup itself — cornflour, enzyme cleaner, peroxide if colour is present. For any terracotta mineral residue (a faint rusty or clay-coloured ring): a dilute white vinegar solution (one part vinegar, three parts water) applied to the ring zone, allowed to sit for 5 minutes, then blotted and rinsed. The citric acid dissolves the calcium and iron mineral deposits from the terracotta.