What is the alternative way to negative special characters such as /


I have an ad group runs board match type, and with around 80+ Customer search term that contain / special characters, and none of them generate order. They have been cost me more than 100usb, and continues growing.
But I cannot negative them, because Amazon Ad system does not allow adds special characters.
Nor I can just Negative Phrase normal words or number that combine with /. Because those word in other search term bring me orders.
This is give me big headache, I wonder how other sellers deal with such situation


did you find any solution for this issue ? Im getting lots of clicks with special characters that arent my product. as 1/4 inch … how to get rid of that ?


unfortunately, i got no solution for this problem. at end i just negatived numbers instead.


Thanks !!