right arrow makes *

hey well the title actually says it all if i press my right arrow key it gives me a bunch of ****** if i write some random letters first and start on the left pressing down right arrow it looks like this: *w*f*g*h*z*w*o*u*f*h* so i noticed it does star first, then a right arrow. and it keeps repeating if i disable the key in synapse 2.0 it makes only stars: rfu*********hfuefhu so despite the key should be disabled it makes stars for some reason Oo things i tried so far. installed drivers new / synapse 2.x and windows ones. plugged it in to another computer -> same result it still made stars there. open it up physically to clean -> no result. but i noticed a metal line goes from right arrow uo to star so maybe it has dirt there so if i press one it activates both? but i cleaned without result. but i only used a paper no water! i use a legacy keyboard and so far it worked like a charm. no problems at all. deathstalker chroma following my theory i just disabled star now. and guess what it works again ;D seems like there must be some invisible dirt connecting the 2 copper? streets on the foil map inside the keyboard. and i can still make a star with shift 3 * ;) so my question would be can the foil map inside be cleaned with very little water or soap? or do i risk on making more dmg than it helps?