Actually there was a discussion about this before on the Inkston Facebook page but it’s difficult to find:
Rona Conti Handiwipes. I do not think there is anything in the unscented kind which reacts with the stone.
Inkston Just wondering what if people want to use a different colour seal paste. Then, it would be important to clean the old seal paste.
Rona Conti The seal paste should always be cleaned whether changing color or not. Dried seal paste will ruin the seal.
Maria Norma Herrera Papp Use an old toothbrush to clean between spaces, after you wipe the seal with tissue paper. Remember, also, to Go around the seal on the four sides or around the chop.