Some git threw an egg at my car the other day while going down a country lane. Scared the c**p out of me

Anyway, I thought I’d cleaned it all off last weekend only to find most of it went through the grill and has baked on to my engine, in particular the exhaust manifold heat cover. I'm gona try and clean it off, but does anyone recommend putting anything on it afterwards to maybe stop it rusting or to keep it in good nik?