A/C plug/socket removal difficulty

[KenK]

I just replaced the extension cord and space heater plug with heavy-duty versions. Plug is hard to insert and remove! Perhaps a little 3-in-one oil smeared on the prongs? Something better? Leave well enough alone?

TIA

[bob_villain]

...as you said, "Leave it alone!" Good connection/small electrical resistance.

[Stormin Mormon]

I'd think dielectric grease.