The RUB should be fine - you just want to be sure the snake has enough room to move around between the damp towels.
And I agree with Zincubus about being cautious when helping with stuck shed. I'm OK with doing it and have never had an issue, but I am super conservative about it - if I feel even a bit of resistance when I am helping, I stop. Let humidity and the texture of the cloth do the work gently.
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