Stain Removers & Wash Aids
Most suppliers state that stain removers such as Napisan/ Vanish may be used as a stain treatment prior to wash or used in the wash as long as you use the stain remover as per the product's instructions.
Stain removers are great for removing stubborn stains, can sometimes be effective in removing yellowing/ discolouration from the inside of PUL shells and grey-ish discolouration from inserts
The use of chlorine bleach may void the manufacturer's warranty if used incorrectly. Check each manufacturer's advice prior to using bleach as some advise against it