Wood: To renew the glow + protect from moisture we recommend applying a product called Howard's Feed & Wax (available on Amazon or most hardware stores) on the clean + dry surface with 0000 steel wool to remove small surface marks (including wall paint) followed by buffing with a soft cotton cloth. After wiping off excess, let it penetrate for a couple hours or overnight before use for best results. The product is a blend of beeswax, mineral oil (aka baby oil), orange oil (main ingredient of goo-gone), carnauba wax (a common wax for adding shine to cars and fruits) and paraffin (candle wax) - these ingredients are generally considered harmless for your skin but are flammable. There are no drying oils (i.e. linseed) so rags are not susceptible to spontaneous comubstion.
Chrome, Stainless Steel: Aluminum foil lubricated with a little water is a wonderful way to scrub off any corrosion without the help of chemicals. Scrubbing will form a wet suspension of corrosion products that can be wiped clean with a paper towel or cloth. Since aluminum is one of the softer metals, it will not scratch chrome or iron-alloys.
Glass: A razor blade is the best way to remove any hard water marks or build-up. We use 91% isopropyl alcohol (available in most drug stores or pharmacies) to clean + remove any oily residues. Isopropyl alcohol is safe to use in small amounts but will dry out your skin since it is an oil-remover.
Fabric: For light colors or heavy use areas we recommend using Scotch Guard to protect fabrics and upholstery from absorbing any stains. Note that Scotch Guard uses a teflon-like chemical, a fluorocarbon type, that is toxic to birds and small animals and should be used sparingly and with care. In most cases, we use Sunbrella brand upholstery, which is more resistant to staining than normal and doesn't require this treatment.