Coins and tokens are both a matter of personal preference. However, and that is a big HOWEVER, there is a well-established marketplace for coins and with enough patience and money, one can acquire almost any coin there is in any condition desired. Some coin grading services won't touch a cleaned coin, and most coin collectors will tell you never to clean a coin. I feel that is because there are plenty of uncleaned coins out there to be had. Tokens, on the other hand, do not have such a marketplace and there are lots of tokens that just cannot be obtained. So, if offered a hard-to-get token, a collector may not really care whether or not it had been cleaned. Same thing goes for wear, holes, digs, etc.
I usually clean the tokens I get if they are in need of it. But I am also not interested in selling them - I do it because I want to see them better.
John in ID