I swear by Kiss Off for major, old stains like this. Way back in my early stamping days I would quite often just toss stamps into a basket to be cleaned later. Well, "later" usually only occurred when the basket overflowed, lol! ugh. Well, one night I sat down with a very wet rag, an old toothbrush, and the kiss off and went to town.
Tap the stamp on the wet rag and get it wet; generously rub the kiss off all over the rubber. Let sit.
Take the toothbrush and really scrub. This is great not just for waterproof ink but for dried-in-the cracks metallic ink (yuck!).
Nothing is perfect all the time, but I'll tell you, Kiss Off is THE best in my book. Look for it in the fine art/artists' brushes section at Michaels. It's right near the brush cleaners, etc. It comes in a small tube and only costs around $5.
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