A painter that we hired accidentally got some clear primer on some our vinyl siding. If we leave it on there, will the primer remain clear or will it change color over time as it is exposed to sunlight? Is there anything that we can use to remove the primer without causing any damage or discoloration to the siding?

Depending on pigment used in primer will determine if it will yellow(discolor) with age. A power washer with a medium nozzle should remove paint without damaging siding.

Chuck

I've never seen a clear primer used outside. Is this vinyl siding? Was he trying to repair a break and possibly used PVC cement?