i did mine. it took about 4 hours of scrubbing with brake cleaner,

goof off, tons of rags and a scotch brite pad. it was a real pita though. here's a pic
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"Dennis the Menace"
1978 Silverado (2wd, 1/2 ton, short bed)complete nut & bolt frame off restomod LQ9/4L80E
MY LS SWAP/FRAME OFF BUILD BOOK
2006 TBSS way too much to list