To achieve the best adhesion on the new surface, it is important to keep the surface clean. Cleaning of the surface is very easy. The best option is Isopropyl alcohol available in drugstores which is the best for ABS, PLA and others, except for PETG where the adhesion may be too strong.
Second option is to use a gentle spray of a window cleaner(Windex or similar) on a paper towel and wipe the surface. The bed can be cleaned even while hot, just be careful not to touch the surface or the nozzle. Alternatively, you can clean the bed with warm water and a few drops of a dish soap on a paper towel. Denatured alcohol is yet another option.
The surface does not have to be cleaned before every print! It is just important to not touch the print bed with your hands or dirty tools.Clean your tools with the same solution as you would the bed and you will be able to start your next print right away.
You can leave small marks on the print surface with your nozzle or tools, they will typically be shinier than the rest. It does not affect the functionality or adhesion. However, if you want to have same surface look on the whole printbed you can resurface it. The easiest way is to take a hard side of dry kitchen sponge and wipe the affected area with circular motion gently few times.
The industrial glue which holds the PEI sheet on the heatbed itself softens when temperatures greater than 110 °C are used. If higher temperatures are used, the glue can migrate under the PEI and create slight bumps on the surface.
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