White clothes washing

I washed a load of whites, t-shirts, tops, vest tops but they look so dull & awful. Is there any product that may give them back their bright white.

Also what temperature do you wash ur whites at.

The washing powder I'm using is Surf with essential oils.

Yes there is, Glo White, it's in a sachet & with the washing powders.

With the exception of a wool wash I now wash everything at 40 and I use whatever washing liquid takes my fancy