[Perfectlap]

high pressure rinse, don't delay. And only clean your softop with Raggtopp cleanser and a soft brush like the OXO feathertip. Follow up each cleaning of the Raggtopp cleanser with Raggtopp protectant.
Porsche also makes a protectant but I think its just Raggtopp relabeled and more expensive.
I avoid bird bombs by covering with a softop cover whenever the car is parked for more than a couple of hours. and don't park under trees if you can avoid it.