The screw-in LED lights in my pool work, but there's mold growing inside them. Can I clean them?

Yes. Follow the steps on how to remove the light, and be sure to turn off the breaker first. If the globe surrounding your LED is sealed, and there are no tabs or screws holding the piece together, place the light in a 2% bleach concentrate for 24 hours. Follow that by letting the light sit in the sun, not submersed in water, for several days or until the condensation is gone. If there are no screws or tabs, use RTV sealant (caulk) at the seam, and allow to dry prior to re-installing. If it is a two piece, substitute the RTV caulk step by replacing the O-ring and re-tighten the bolts or screws.