it won't ruin the nickel if you try it. acetone is not a miracle solution. doesn't work on certain applications. your call, but I think your going to have to leave it in acetone at least 24 hours. don't for get to keep it submerged , or the acetone will evaporate ,leaving crude on your Buffalo.
Acetone will not hurt nickel, and nickel is subject to PVC contamination as well. However, verdigris - which acetone won't help much - is also a possibility. Try acetone/xylene first, but it may not do the job.
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