A/C plug/socket removal difficulty

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
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On Saturday, January 2, 2016 at 7:54:39 AM UTC-6, KenK wrote:

...as you said, "Leave it alone!" Good connection/small electrical resistance.
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On 1/2/2016 8:54 AM, KenK wrote:

I'd think dielectric grease.
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