wax stain help

just opened a 78 wax box(actually a while ago,just collating now)got from steve at bbce.as always 36 wax stains.but one happened to be #36 murray.not badly centered.how much does this knock card grade down and any remidys to try. thanks.
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Comments
looks PSA 7 without the stain, try some nylons to get it off, may not get it all tho?
Good Luck
This was a wax pack correct?
Steve
<< <i>How is possible left unopened with Murray showing?
This was a wax pack correct?
Steve >>
You have never seen a pack slabbed with stars showing
on either the front or back?
BBCE
May not be the easiest to distinguish, but possible
duno if 78 are hard to read?
Jus sayin