Pesky Spirit/Ouija board

I need some advice. About 3 years ago I started using the Ouija board with a couple of friends. A certain less than wholesome spirit came through (I agree with the previous precautions about naming an unwanted spirit and giving it power and entrance to our plane). Since then this spirit has taken over every board I have used unless I specifically request a positive spirit by name and sometimes even then. I have used holy water, rosaries, and crucifixes to make it leave the board, but it takes a while. Apparently my house must be sufficiently protected to prevent the spirit from staying here or causing a more serious problem (I do cleansing/blessing rituals in the house periodically). However, when I first met the spirit, he pretended to be a young girl who was lonely and wanted a friend. A naive associate stated that 'she', the spirit, could stay with my friend. This person had a very difficult time making the spirit leave after he played tricks on her for a while in ! the house. I know when he comes on the board because he is very sexually vulgar, no matter what lie he tells me about who he is. This spirit wants some very kinky sexual stuff, and I'm definitely not into that. He's more of a hassle than a serious problem, but I hate the fact that I can't use the board without his interference when I never invited him to hang around me and I specifically order him to leave every chance I get, and he simply won't take NO for an answer. Any suggestions? I've bought about 3 or 4 boards in the last few years, and somehow he gets onto every one of them. You can write me at realguy2712@yahoo.com . Thanks for listening