Rear wheels off and handbrake clean time before WOF. Only time it works properly

Piston and seal change on one of the rear calipers, changed the other a few months back after a pad change and when the piston was pushed back the corroded area on the piston ended up in the seal area.. Leaked like a sieve.
Other one was fine, but was going to change it anyhow...
Its starting to go so good timing...
Also clean the last of the mud and silt out from Stadia...