Nothing like painting an airplane, but a big honey-do.
We took apart the garden fountain, cleaned it, drained all the water, pulled the pump. I was "allowed" to lift the 2,000 pound off the base and set it on the ground. Well OK, maybe 100 pound statue.
Then I had to get the koi pond ready for winter. Thet meant pull the pump out, hose it off, and all the filters. The real mess was the bottom of the box the pump sit in. It had about 3 inches of fine crumbs of alga. Impossible to pick up bu hand.
So out comes the shop vac. Hook up all that, get electricity to it, And suck out the crud. The put it all back together, fire up the pump, and lots more water flow! Score.
Then I was pointed to the attic to pull down the pond cover we made 15 years ago. It does a good job of keeping the leaves out of the pond.

The Koi pond in summer

Said water fountain.