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It's very common in Latin America and also here to use "Azul" to make whites whiter. It's a rather small looking cube "pastilla" that will dissolve in water as if it were blue ink. You put it in a little bag and in water with your whites inside and in the sun for 10-15 minutes (only works for whites!). Most detergents now incorporate it but when used full strength is pretty amazing what it can do. If that doesn't make your whites whiter, forget about trying anything else. You got to be very careful not to put too much in your water. If you never used it before, test it first with something white you don't care if you ruin it. You can buy them at groceries stores. I'm not sure if colmados carry it. I bought it at Janet's in Cabarete.