Daily:
Remove your hearing aids when applying cosmetics, hair spray, suntan lotion, perfume, and aftershave as they may get into the hearing aid and cause damage.
Clean your hearing aids using a soft cloth, tissue or proper cleaning tools to remove earwax, grease or moisture. Do not use water or solvents as these can damage the hearing aids.
Store your hearing aids in a cool, dry place when not in use and leave the battery pack open to preserve battery power.
Regularly
Use a damp cloth to clean the receiver tube and receiver dome.
Do not use a direct source of water when you’re cleaning receiver tubes or the receiver domes.
Contact your hearing care professional for replacement components when they become stiff, brittle or discolored.
Other tips
Never immerse hearing aids in water or other liquids or wear while showering, swimming, in heavy rain or in a moist atmosphere such as a steam bath or sauna.
Leave wet hearing aids to dry with the battery out and the battery door open.
Put the hearing aid and battery in a sealed container together with a drying agent (desiccator) overnight. Don’t use the hearing aids until completely dry.
Don't leave your hearing aids in or near direct heat or sunlight.
Avoid rough handling of hearing aids or dropping them on hard surfaces or floors.
Read the instructions for your hearing aids or contact your hearing care provider for additional hearing aid maintenance instructions.
Resources: https://www.resound.com/en-us/help/maintenance-troubleshooting