If you have acid you can use some to clean the tip.
Your carpet is most likely made of nylon which is plastic.
Acid will clean off the plastic but the tip which is made of some kind of metal won't be affected.
Be really careful with the acid if you choose to clean it that way.
Once its clean, wipe of the tip with some sponge or something. If you just leave it to dry, it will get some weird color but other than the coloring it will be fine.
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