after every use .. wipe w/ alcohol 90%, remove sap, sharpen, oil, wipe off excess - store
any brand isopropyl alcohol (not rubbing alcohol - w/additives) ....90% dries faster ....
alcohol kills off most every contagion that could affect plants and stop the spread if any exists
wipe off any dirt
many plants have some type of sap ....this sap will dry on the metal blades, causing rust if left on the metal ....if allowed to build up the effectiveness of cutting greatly reduced
I use scotch brite pads to remove the caked on stuff
a diamond hone to sharpen blades
for oiling - use SuperLube / or clear grease to protect blades from rust ....rub in - rub off ..oil all joints and your pruner should last a lifetime