Washing your whites with other colours, and/or you are using washing powder instead of laundry liquid, are to main contributors to your whites turning grey.
We recommend that you use laundry liquid rather than washing powder for several reasons:
– Washing powder are combined with fillers which tends to leave a residue particulars on your clothes
– Washing powder needs to be used in warm water and be set at the best temperature to work effectively
– Liquid dissolves in cold or warm water so no residue is left behind on your clothes
We always recommending washing whites with whites only and not mixing colours.
You may also be interested to know that some fabric softeners have a very mild bleaching agent and this may effect your garments.