FSi buying help

When I had a TDi and was (due to geographic availability) forced to buy supermarket fuel, I used to add a few glugs of Redex to counteract any impurities. Must admit I have only filled up the FSI twice since buying in September (not being allowed to go anywhere and all) and not being aware of the above have used regular fuel. Would Redex perhaps help in some way? I have added half a bottle with each tank
 
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