Is there a way to 'cleanse' a ouija board?

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I've been having sooo much trouble with it. The same entity (an angel, apparently) has been in it for quite awhile now, threatening me, ,lying to me, going off on long spurts about things that make NO sense, and I think it even pretended to be a demon, giving me wierd advice and things that made no sense =/ This is quite frustrating, as I really want to get closer, persay, to Father and my guardian (my parents found out about all this so ways of staying close are limited.. I no longer have incense or anything to do rituals with and they took my black book =/), but this thing is SO irritating! Is there a way to like, cleanse my board, or banish this entity? Keep in mind I don't have a lot of materials or anything to do anything to extravagant
Thank you