I have bought a ZEP product from Home Depot it comes in a gallon jug & is orange colored that works well at removing the yellowing you are talking about. I am out at this time so can't give you the item/product number.
There are several citrus based cleaners that Wal~Mart sells & I am tempted to try one of them.
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Everett & Joan after 60 years together. 2004 1/2 ton Chevy & 2011 Rockwood 1809S
Number of nights camped in 2012 65
Number of nights camped in 2013 82
Number of nights camped in 2014 105!
Number of nights camped in 2015 81
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