(W124) Ok, I know I will sound like a crazy question. I have terrible allergies, and some contamination in the A/C Heater Box. You know the score. I have tried running Ozone trough the system, and that did help. Tried every spray can and foam - for years - with no real improvement. Even tried the $100 Liqui-Moly Compressor-based system...long tube with tiny spray nozzle, shoots disinfectant through all the ducts.

Great idea, but still won't get deep into the tiny A/C coils.

There is currently NO complete solution to the problem So I don't use the A/C or heater.

My (possibly 'hare-brained') idea...Since the heater box is "water-proof" - to "some" degree - 'sealed', with a drain (at bottom)....my idea was: Fill the entire box with 1-2 gallons of cheap Hydrogen Peroxide...fill it up over the top of the coils. Peroxide will kill (oxydize) every organic molecule in there (mold, etc). I've used it for years to wipe out allergens, fogged it even. ... Let the box drain out... then run the heater for 30 mins. It's shouldn't corrode or rust anything as long as it's drained and dried fairly quickly. Question is: "Would it mess up any other part of the A/C mechanically?" It's just a sealed, waterproof box with a coil and coolant pipes, right?

Any help would be appreciated. Summer is coming!!