OK thanks, I'm just worried about the position of it. It's right at the joint at the bottom, not sure about the pressure. I will try to fill it slowly.
I just finished the first cleaning, it was that caked up with dust, leaves, and bird crap. I'm going to give it another wipe down but with hot water this time, then hose it, drain, then another wipe down. Do you think that will do? Then onto the painting...