Thank everybody for answers,but i dont understand what you mean whith that word – sweep.I try on one side use sand paper to remove grooves,but after that side start scratching.Mayby seed from sand paper goes into the lap=(.Now i have 2 problems grooves on one side and scratchs/silk on another.I try use corundum to remove grooves/scratching but it do not helps.So please help me understand what you mean whith this word – sweep,because i understand it like clean.If somebody have photos/videos please post it!
Thanks for everybody again.