how long do i boil dildos for? is it different depending on the material? if they have motors and i just 'dip' half the toy in how safe is it?
Typically boiling for 3-5 minutes is sufficient to clean 100% silicone toys. You should not boil any silicone composites as they will not withstand the temperature. Motorized toys should also never be boiled because the heat may damage the motor. A 10% bleach solution would be safer for cleaning.
Boiling or bleaching is not necessary to clean silicone toys. Most of the time I just use soap and water - the boiling or bleaching would be when you need to sanitize them (for instance using them with a different partner that you're not fluid-bonded with).
To sanitize in boiling water you need the whole surface of the toy to come to 200+F for a couple of minutes, so dipping doesn't work. For motorized toys use bleach spray.