hi moosebarter, I asked a question "cleaning vinyl stone guards of road dirt" in the General Forum some time ago, I think the replys I got could be applicable to your problem too. You can find it on page 94 of the General Forum. My the forum has been busy hasn't it, time flys when you are having fun.
terry
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Chris & Terry
3.2lt 4 x 4 Mazda BT 50, single cab chas with full alloy canopy
White vinegar and water in a spray bottle and a sponge to rub it off and a cloth to dry the vinyl 25% vinegar to 75% water. Or any of the non chlorine bleaching sprays like Orange GP cleaner from Woolies. Have used both and the results are similar.
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Pets are welcome but children must be leashed at all times
White vinegar and water can also be used to clean your copmuter screen, do NOT spray it on the screen, spray it a cotton cloth and wipe in circualar directions, then polish with a dry cotton cloth.
Be careful using anything that has bleach or harsh chemicals in it. We had a Bimini on our Yacht which would be of a similar fabric I would imagine, it is very hard wearing but the stitching can be damaged by using products with bleaches or similar. I had a boating friend have theirs fall apart and it had to be restitched after not rinsing well enough. So read the ingredients carefully...I learnt my lesson through them...lol.