The mythe of derusting with lasers explained?

Today on YouTube, we see a lot of companies presenting their laser magic by derusting a surface that looks new. Even the most Chinese-offered lasers are non-pulsed low-cost lasers with high power outputs. So what is the catch here? First, you need to know that many different types of rust exist. We have superficial and deep pitting rust where the base material is affected. The Chinese laser companies ignore the differences and sell you a low-cost CW laser heat torch. They even have scientific university studies to explain the good derusting possibilities with a continuous laser called CW. The CW laser is the most accessible laser you can produce in the laser world. The Chinese dominate the CW market with cutting and marking lasers of this type and try to sell you this type as a magic cleaning system. Due to the fact the derusting is based on a shrinking or dilatation effect, in short, the breaking off the oxide particle from the surface by temperature  difference of  between surface and particle, you need a shock effect to clean it. So, only pulsed lasers can be  more efficient. The CW laser is a heating device that turns the red rust particles into the black rust-oxide variant. If you need to paint your surface, this is not a good surface preparation. Pitting rust is also tricky for a pulsed laser because the rust particle has adherence on the surface. If you clean it the surface will look dark grey, but below, there is still rust.