I don't recommand cleaning boards with water.

Use pure or at last 98% pure Isopropyl alcohol: this evaporates almost immediately and is good for cleaning and removing fluid from leaking capacitors.

Here's how I work

- remove the old capacitors

- remove all old solder from the pads

- fully clean the PCB

- resolder new capacitors

- clean the array where you soldered and remove flux residue