Twin Air Bio Dirt Remover, Air Filter Cleaner 900gKeep your foam filter in like new condition. Features: BIO Dirt Remover cleans Liquid Bio Power oil by using granular detergents instead of solvents; water soluble cleaner can go right down the drain without clogging the drain or harming the environment; will not harden or damage filter foam. BIO Liquid Power filter oil was developed and produced by Texaco exclusively for Twin Air; exceeds the strictest standards on biodegradability by 16%; starts