How to get rid of gray residue ?

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i been using thompsons for years with great results EXCEPT this year, when it dried now half my deck has this gray residue / color , dont know why , i did it normally as i do with a roller , took of any excess , no rain for days before i did it , no rain for 4 days after i finished it , i got a message out to them , so will see what they say , wondering if anybody else had this problem


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