A guinea pig enclosure needs a true deep clean, not just fresh bedding scattered over a dirty base. Guinea pigs produce a lot of waste, urine soaks into corners and fleece, and stale residue under clean bedding keeps ammonia close to an animal who lives and breathes right at floor level. The safe method is unglamorous: pig out, everything out, plain cleaners only, and nothing goes back until it is completely dry.
Set your guinea pig up somewhere safe first
Move your guinea pig to a secure playpen or a clean, lined box in the same room, with hay, a hide, and a few vegetable pieces so the wait feels like an outing rather than an eviction. Guinea pigs startle easily, so keep the holding spot away from the noise of shaking fleece and running taps. Wash your hands after handling soiled bedding and before you handle your pig again at the end. If you keep two pigs together, move them together — separating bonded companions for a cleaning session adds stress neither of them needs.
Empty it right down to the base
Strip out all bedding or fleece, remove hides, tunnels, hay racks, bowls, and the water bottle, and shake loose debris into the bin outdoors or into a bag you seal straight away. Wash fabric hides and fleece liners in a hot wash with an unscented detergent, and rinse them an extra time so no detergent residue sits against skin and feet. Wooden items that are heavily urine-soaked may never truly come clean; if a wooden hide still smells after washing and a full day of airing, replace it rather than returning a permanent odor source to the cage.
Scrub with plain, pig-safe cleaners
Wash the base, ramps, and bars with warm water and a solution of plain white vinegar and water, using a cloth or brush to lift urine scale from corners where it crusts white and chalky. Vinegar cuts through that mineral crust far better than water alone, and it rinses away to nothing. Rinse every surface until you cannot smell vinegar at all, because a guinea pig's nose sits inches from the floor you just cleaned. Avoid scented sprays, bleach left unrinsed, and strong disinfectant fumes entirely; if you use a pet-safe disinfectant on a stubborn stain, rinse repeatedly and air the base until it smells of nothing.
Dry fully, then rebuild the layout
Dry the base with a clean towel and let it air until corners and joins hold no damp at all — fresh bedding laid over a wet base turns musty within days and undoes the whole job. Refill with clean bedding or a freshly laundered fleece, add a generous pile of hay, scrub and refill the water bottle including its sipper tube, and return hides and tunnels. Put favorite hideouts back in familiar positions so the space smells new but still maps the way your guinea pig expects.
Signs the clean needs to go further
If a sharp ammonia smell returns within a day or two, the base itself is holding urine in scratched plastic or a corner was missed, and it needs another scrub rather than more bedding. Squeaking with straining, blood-tinged urine, or a pig who stops eating are not cleaning problems — those need a veterinarian promptly, and a spotless cage will not fix them. Note when the smell, appetite, or droppings change, since that timeline helps a vet judge what is happening. Recording the deep-clean date in KinsLe under Care Teams, with the duty ticked off and time-stamped, gives everyone in the household one shared view of when this enclosure last had its full reset.