First option
A cleaning with a machine dedicated to this operation and allowing a good deslagging of the grooves. The product used has been specially developed to suspend the dirt embedded in the grooves and is absolutely not dangerous for your discs. Under no circumstances can it damage the surface of the disc and the suction process of the machine allows a complete removal of residues. This cleaning process obviously does not restore a disc that has been scratched or warped, so you should evaluate whether this is the right solution for you.
Second option
A more drastic cleaning with the help of a gel that is applied over the entire surface of the disc and left to dry. This gel film is then removed and all the dirt in the grooves is removed. This is a longer (4 hours per side for drying) and more expensive process but it is proven to be the best way on the market to perfectly clean a disc. This process should be reserved for valuable discs or those that are particularly important to you.
If you don't know which option to choose and would like to have an opinion or discuss it, don't hesitate to contact me.