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removing caliper pistons

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AshimotoK0:
The last three 400/4 ones did last year (which a came from a plastic boxes left in a garden for over 20 years + and were really grotty )  I removed by boring a hole just a bit bigger than the piston in a piece of hardwood then whacking the caliper on the wood so that the inertia of the piston shifts it out gradually. Once the piston is flush with the caliper I then do the same thing over the hole in the wood so that piston can move out fully.
 
I have also removed stuck caliper pistons, by drilling and tapping the bottom of the piston M10 and screwing in an M10 bolt tipped with a bit of nylon (to prevent damage to the alloy) to extract the piston. This is only any use if the piston is knackered but TBH every siezed one I have done has suffered pitting of the crappy chrome.

Personally I have never tried the grease method but it obviously works. I guess it's difficult  if the the rigid  pipe  union is seized/sheared off in caliper body though.

Anyone have tips and tricks  on cleaning out the seal groove? Best tool to use?

Bryanj:
Dental pick or set of mechanics picks using right angle one to get into corners, then after all the crud is loose possibly a brass brush in a dremel.
I found just using the brush just polished the hard crud and didnt remove it.

SumpMagnet:
To shift the rear piston on my 750, I had to use a load of heat as well as brute force. Nothing was shifting it.

I assumed the piston would need replacement so I clamped some mole grips on, applied heat until the piston actually shifted a fraction....then I could apply hydraulic pressure to pump it out. There was corrosion on the piston...and a small amopunt in the caliper body...but considering the fight I had to shift it...far less than I was expecting!

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