Clean it when your notice problems -- never before.
Every 50 or so tapes, I open and visually inspect my units for debris on the heads and in the transport.
If something is wrong with the video, and it effects every VHS tape, especially ones that were previously "fine", then it may be in need of a cleaning.
For only 150 tapes, you should be fine, assuming non shed oxide inside. (You have my sympathy if it does, as that's is a nasty mess to clean up!)
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