My husband uses showroom shine it's fantastic you don't need to wash the car as it's a 3 in1 cleans, polishes and protects. Spray in on use a microfibre cloth to take off and another microfibre cloth to buff it up, just don't do it on the windscreen, but it's fine on the other glass it'sto do with the wax.Don't know if any of you have seen the demo we brought it off of ideal world. He didn't think it would work but it's does, gets ride of all the buckets and hosepipes! Had tar on our old car and it came off no problem.