Get chemicals from supermarket, pour it into the basin, pour hot water, clean everything with acid, or? I'm looking a green way to clean the basin, the tubes are open but there is a smell coming up from the tubes. edit:as an answer to bleach I'll recite from grist.org:"The corrosive ingredients in these products can severely irritate eyes, skin, and the respiratory tract, and can be fatal if swallowed. Chemical drain cleaners are among the most dangerous of all cleaning products, containing sodium hydroxide and sodium hypochlorite (bleach) that can permanently burn eyes and skin. In oven cleaners, lye and sodium hydroxide can burn skin, eyes, and the respiratory tract."the p-trap in the kitchen is made of metal, anyway I guess it can be removed and cleaned manually which seems like the best way. the air valve in the kitchen is the yellow one, so I think it's not the water that blocks the air blow.I don't think I have a disposal ( is it the machine with knifes under the sink? i don't have that one)but I'll try to pour a some lemon juice, too.I think the enzyme cleanser is this one:http://www.thisthatotherthings.com/bacoutfoamer.html?productid=bacoutfoamer&channelid;=FROOGbut I live in Italy, so I'll try to find another one at least in Europe.as I live in an apartment, I can't clean more than the pipes under the sink, not to mention to change them.other solutions I've found are: *Pour down half a cup of sodium bicarbonate (or baking soda or sodium carbonate) and half a cup of vinegar, wait 15 minutes, pour down 1 lt. boiling water. I translated it from another language and there is a confusion here about sodium bicarbonate, baking soda and sodium carbonate, I didn't get which one to use.this works for opening blocked drains or the toilet. BAKING SODA IRRITATES YOUR SKIN, USE GLOVES. it makes a chemical reaction and you should be careful when it boils. but the ingredients are harmless to nature.to disinfect:*Mix 2 spoons of borax, 1 cup of vinegar and 500ml hot water, use it for toilet, and similar surfaces.I don't know how/where to find borax (water+O2+sodium+bor) but this solution might help for the smell.