Sometimes carpet tiles curl at the edges. Rotary system of any type can catch the edge and make the condition worse. Some manufacturers recommend not using a rotary machine or rotary extraction tool on their carpet tiles.
Water getting in the opening between tiles is another common issue. This can make the carpet and floor very slow to dry. This is the reason low moisture products are so often used for carpet tile.
I suggest cleaning with a
CRB like the Brush Pro. Use an encapsulation product. Encapuclean O2 is a good choice. There are a few products that the manufacturer specs a dry
compound. Brush Pro does make a dry
compound with encapsulation properties for these tiles.
When you do restorative cleaning, use HWE with extra slow vacuum passes. Some have told me that a glided wand is helpful to get necessary airflow. Those solid backs tiles don't allow much airflow. Leaving the spent cleaning solution and suspended soil behind because your vacuum did not extract it can be a real problem.
I am working on projects involving carpet tiles from two different manufacturers right now. I have seen these issues first hand. I have seen how they clean with different methods.
Scott Warrington
Technical Support
Interlink Supply / Bridgepoint Systems