I'm not going to play "expert" here, but years ago I talked on the phone with a representative from one of the cloth top manufacturers. He may have been from Haartz.
His advice was to wash the top with a cleaner/soap as little as possible (certainly easier if the car is garaged) and to use cloth top specific cleaners and protectants. He mentioned Raggtop specifically as one they approved of. The concern he said was to preserve the stitching. Additionally, he said every time you use a cleaner you strip away any protectant that was on the top and will need to re-apply. Use a vacuum to remove surface dirt and do water only rinses with a very soft brush to get rid of deeper dirt.
Your mileage may vary....
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