Pooja silver gets a harder life than jewellery. It sits in a room with burning camphor, gets oil and kumkum on it, is handled daily, and is often not cleaned for years at a stretch. Here is what works, and more importantly what to avoid.
First: is it meant to be shiny?
This is the question people get wrong most often, and it is expensive to get wrong.
Much traditional silver work — including most of what is sold as antique-finish idols and vilakku — is deliberately oxidised. The recesses are darkened on purpose so the detail reads. That contrast between bright high points and dark recesses is what makes the carving visible at all.
Scrub an antique-finish piece with an aggressive silver dip and you will strip the oxidation out of the recesses in seconds. The piece will come out uniformly bright and the detail will visually flatten. This is not reversible at home. If your idol has intentionally darkened detail work, clean only the raised surfaces and leave the recesses alone.
A plain high-polish piece, by contrast, can be cleaned all over.
What works
A silver polish cloth. For light tarnish this is all you need, and it is the safest option by a wide margin because you control exactly which surfaces get touched. Buy an impregnated cloth rather than a plain one.
Mild soap and warm water. For oil and ghee residue, which is the main thing accumulating on pooja silver. A drop of dish soap in warm water, a soft toothbrush for the crevices, rinse thoroughly, and then — this part matters — dry completely with a soft cloth. Water left sitting in recesses causes fresh tarnish and, on pieces with any base-metal component, corrosion.
Baking soda paste, used carefully. A thick paste of baking soda and water on a soft cloth handles moderate tarnish on high-polish silver. It is mildly abrasive, so it is not for antique finishes and not for anything with stones or enamel.
What to avoid
Commercial silver dips on anything with an antique finish, enamel, meenakari work, pearls or set stones. Dips work by chemically stripping the surface and they do not distinguish between tarnish you want gone and oxidation you paid for.
Toothpaste. Widely recommended online and genuinely bad advice. Modern toothpastes contain abrasives sized for enamel, not silver, and they leave fine scratches that dull the surface permanently.
The foil-and-baking-soda bath. The aluminium foil trick works chemically, but it is indiscriminate — it will strip antique finish everywhere it touches and it is difficult to stop halfway.
Anything abrasive near set stones, pearls or enamel. Kumkum staining around stones is best left alone or removed with a soft brush and plain water.
Camphor and kumkum
Camphor soot is carbon and comes off with mild soap and a soft brush. Kumkum is the harder problem — it stains porous surfaces and settles permanently into deep recesses over years. Get it off soon after it happens rather than at annual cleaning. Old kumkum in the recesses of an antique-finish piece is generally accepted as part of how a well-used pooja idol looks.
Storage and slowing it down
Tarnish is silver reacting with sulphur in the air, so the goal is limiting air contact. Anti-tarnish cloth bags or pouches with a silica gel sachet work well for pieces that are stored rather than displayed. Avoid rubber bands and newspaper — both contain sulphur compounds and will accelerate tarnishing badly.
For displayed pieces, an annual clean with a polish cloth is enough for most households, and twice a year for a vilakku in regular use.
One last thing: some tarnish is good. A completely uniform bright finish on an old idol looks new in a way that older pieces should not. The darkening in the recesses is the record of the object being used, and most families come to prefer it.
Our silver idols and vilakku are 92.5 sterling with a hand-finished antique surface — clean the high points, leave the recesses.