Convert all the tokens to BTC or another cryptocurrency so that no useless tokens remain in your wallet. No way to delete them. Only withdraw or convert.
I don't think that you understood the question. In an ERC-20 wallet, there is no option to convert your tokens. For that, you need to move the tokens to an exchange account and trade with them. But moving out these tokens will incur a certain fee. And that is the reason why the OP is getting frustrated. He doesn't want to spend his hard earned money on getting rid of these worthless tokens.