Different surfaces, different handling
Algae cleaning goes wrong when every surface gets the same treatment. A resin ornament, a piece of rock or a chunk of driftwood can leave the tank and take a firm scrubbing. A live plant cannot — haul it out and scrub it and you will tear roots, snap stems and strip the very leaves you were trying to save. Silk and plastic plants sit in between: they can come out, but their edges and fabric fray under a stiff brush. Before you touch anything, sort the pieces in front of you into those three groups, because each group gets cleaned a different way.
Hard decorations: out of the tank, into old tank water
Lift rocks, ornaments and driftwood out during a water change and set them in a bucket of the water you have just siphoned off. Scrub them there with a brush or an algae pad reserved for aquarium use only. Old tank water matters: it carries no chlorine, so the beneficial bacteria living on those surfaces survive the cleaning instead of being killed by tap water, and the decoration goes back in without shocking the tank's chemistry. Work the brush into crevices, hollow logs and the undersides of ledges, where green and brown films collect thickest and where grazing fish rarely reach.
Rinse each piece in the same bucket, shake off the loose debris, and put it straight back. If a decoration is heavily coated, leave a patch of growth on the underside — shrimp, snails and many small fish graze those films, and stripping a piece sterile removes food as well as eyesore.
Live plants and silk plants: cleaned in place
For live plants, keep them rooted and work underwater. Rub each leaf lightly between your thumb and forefinger and the soft green or brown coating slides off; a soft cloth does the same job on broad leaves like anubias. Trim away any leaf that is more algae than leaf, since a dying leaf feeds the problem instead of fighting it. Silk and plastic plants can be lifted out and wiped down in the bucket with a soft cloth rather than a brush, then rinsed and returned before they dry out.
The rule that protects your fish
Never let soap, detergent, washing-up liquid or any household cleaning product touch a decoration, a plant or the brush you use. These products are designed to leave active residues on surfaces, and what rinses clean to your hand can still damage gills and skin at aquarium dilutions. Hot water and elbow grease handle everything algae throws at you; if a piece is so encrusted that scrubbing fails, a longer soak in old tank water and a second session beats any chemical shortcut.
Slow the regrowth, not just the scrubbing
Scrubbing treats the symptom. Algae returns fastest where light runs long and uneaten food and fish waste feed it, so shorten the lighting period a little, check you are not overfeeding, and keep up the partial water changes that export nutrients. Cleaning one or two pieces per water change, rather than deep-cleaning everything in a single afternoon, keeps the tank stable and the job small. If the algae duties are shared in your household, KinsLe Care Teams lets you assign the plant-and-decor scrub to whoever is doing this week's water change and see it marked complete, so the tank gets its rotating clean without one person carrying every session.