If you clean your panels monthly, then this may be all you need to clean them. Make sure to squeeze out the cloth or sponge before wiping the bulb. Water could damage the electronics if it drips into the panel. Remember to always check the cleaning directions from the manufacturer of your lights. Different products may have different cleaning needs.

If you use a sponge for this job, don’t use the rough side. This could scratch the panel.

You may have to re-wet the cloth to remove all the soap. You could also run the panel under a faucet, but make sure to keep the water away from the light’s internal electronics. These are underneath the panel and inside the light globe. Keep the water focused on the panel itself and don’t let the underside get wet. [4] X Research source

This cleaning schedule may change depending on where you live. In a damp environment, the lights don’t need cleaning as often. In a dry, dusty environment, they might need a monthly cleaning. Monitor your lights and clean them when they’ve accumulated a layer of debris.

Painting tape is available at hardware stores. You can also use masking tape. Don’t use a sticky tape like duct or packing tape. This will be difficult to remove and will leave sticky residue behind.

Only apply one coat unless the panel is still faded. If so, spray a second coat and let it dry for 30 minutes. Don’t use a type of lacquer that has to be brushed on. This will be too thick. Keep the spray can moving. Don’t let the lacquer pool in any spots.

Wearing goggles while handling corroded batteries is also a good safety measure, just in case any residue splashes up. If you were using alkaline batteries, then throw them out. Put special solar batteries in after you clean the terminals.

Don’t pour the vinegar out. This could flood the electronics. Only apply a small drop. If you’re worried about pouring too much vinegar, then dip a paper towel into it and rub it on the corrosion instead.

Wear goggles during this step. The corrosion could splash up as it comes loose.

Check with the instructions that came with your lights for recommendations on the best type of battery to use.