Are you using the stock filtering control or you have developed your custom filtering control? Because the stock filtering control clears column filters like this:
In case you are clearing the filters manually, you have to use the above code.
Simply calling RadGridView.FilterDescriptors.Clear will indeed remove the filtering, but the column filters will preserve their settings (although they will not be part of the FilterDescriptors collection). To completely clear a column filter you have to call column.ClearFilters();
In case you are having trouble with the stock filtering control, could you please send us a small dummy project that demonstrates this issue and we will debug it right away.
All the best,
the Telerik team
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