Anthony -- wake up Sat and ask them if you can wash the car for them... and say nothing of compensation. If offered money later refuse it. Just say something like "Just happy to be able to help out"
Next weekend do something different... volunteer...
Third weekend out... smack it on them... "I would like to subscribe.. is that a possibility?" I think they would feel bad not to!
Of course they could see right through the whole thing and label you a brown-noser.. it's a chance you have to take!