Twin Air Bio Dirt Remover Twin Air Liquid Bio Dirt Remover is designed for cleaning Liquid Power-oiled filters. Whether you opt for a washing machine or choose to hand wash the filter in a bucket, this granular water-soluble cleaner allows for easy disposal without causing drainage issues or harming the environment. Unlike other solvents, Bio Cleaner maintains the integrity of the filter foam, preventing hardening or damage even with repeated washes. Features: Suitable for both washing machine and handwashing methods. Granular water-soluble cleaner ensures easy disposal without clogging or environmental harm.