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hellosailor · 16-12-2013, 15:40

Ed, I had an evaporator (the coils behind the glove box) fail on a car, and the shop that fixed it gave me a big can of "shaving cream" with a hose on it. The idea is to push the hose into or onto the drain tube (which is usually under whatever pan/coiul you have) and then blow out the shaving cream, which is a product designed to clean the coils without harming them. Since it foams and expands it can '"go uphill".

You might be able to get that stuff at any auto parts store.

If not, I'd get a pump sprayer, for garden/deck spraying, and either get a bent nozzle for it, or bend up the nozzle, so you can insert the wand and they spray it up and around the coils. Insecticide sprayers usually have tips like that, to spray inside walls.

Your choice of whatever you think will kill the crud, followed by a good water wash to make sure it doesn't attack the coils.

Hydrogen peroxide might make a good crud killer. Hair supply places carry it in much stronger concentrations (40%) than the 3% stuff from the drugstore.

**Hudson Force** · 16-12-2013, 15:43

All solutions can be described as having a pH factor which is related to their hydrogen ion concentration. "Whacked out" is never a condition of pH. Vinegar has a pH of 4 to 5 (a weak acid) & "bleach", sodium hypochlorite has a pH of 11 to 12 (a strong base). Chlorine in not the same as bleach, but bleach contains chlorine. Yes, sodium hypochlorite will react with aluminum and should be rinsed well if used on aluminum surfaces. A little misunderstood annecdotal information can lead people far from truth. There's some good information on this thread, but much poor science too. 'makes me wonder how much incorrect stuff we hear about boats, which is a topic that I would expect more here would know about!

delmarrey · 16-12-2013, 15:48

For this side of the world....... Dri-Eaz Products | Microban Milgo Plus (formerly QGC)

When I use to work in building maintenance several years ago we used a product called Milgo, which has been upgraded to Milgo Plus. It can be deluted and sprayed right into the coils while it's running. It did a great job of killing bacteria and smells.

I now use it on my canvas to keep the mildew and mold off. Also, around deck drains and corners where moisture stands

**Hudson Force** · 16-12-2013, 15:57

Quote:

Originally Posted by hellosailor

................and the shop that fixed it gave me a big can of "shaving cream" with a hose on it. The idea is to push the hose into or onto the drain tube (which is usually under whatever pan/coiul you have) and then blow out the shaving cream, which is a product designed to clean the coils without harming them. Since it foams and expands it can '"go uphill". ...............

I ike this idea of using a soap or detergent on the coils or in the pan at regular intervals and rinse it all away without using caustic chemicals. Someone might need to use something harsh to kill microbes and break away years of neglect, but once this has been done, hellosailor's plan sounds best!

**klmmicro** · 16-12-2013, 16:29

There are sprays designed to clean the various things that cover coils over time. I have a background in commercial HVAC and we used to clean the evap coils once a month. The foaming type works the easiest and can be bought at Home Depot or the like for under $6. It will "scrub" the oils and scum from the fins.

There are tablets that will clean out the drain pan and lines. You just drop them in and they kill of anything growing in there. Over time, they drain down in to lines and clear them out as well.

The more humidity you have to deal with, the more chance for things to grow.

Pelagic · 16-12-2013, 20:58

Luckily boats our size do not have long ducting runs, which is where the real challenge of cleaning out accumulated mold exists and steam cleaning is used on large buildings and ships

I have 3 MarineAir Con units which see lots of hours when I am living on board at a marina.

Every 2 years or so the fancoil units are taken out, pressure washed clean and compressor is load tested. Takes about 2 hours per unit
For preventative maintenance vacuuming of return air filter and using the Tea tree gel packs, prevents inefficiency and growth in high humidity