So we must be very dirty because my Fuller String mop head needed replacing in only three months time! I had to go with a commercial looped string mop which really works well and is lasting longer. It is large and heavy, and requires a professional mop wringer, but the weight of the mop does much of the cleaning for you. I also tried a stronger cleaner, LA's Totally Awesome concentrated cleaner(ammonia and bleach free) from the Dollar Tree. This put a shine back on the painted concrete floors and got up a lot of my daughter's glue and paint. I used it on the laminate floors and got good results as well. About a four of a cup of it in a bucket with hot water is all I needed for heavy floor cleaning.
Winco 800g Blue Yarn Looped End Mop Head 32 Ounce
See how the strings are looped and tied across at the end? This makes them last longer because they don't unravel and tangle. The string mops that are cut across tend to fray and disintegrate.
GJO60466 - Mop Bucket Wringer Combo, four 3 inch Casters, 26 qt., Yellow