How to improve print quality

I bought a used printer. Print quality was poor. On the second print, the photopolymer spilled into the printer and flooded everything. I cleaned the printer and cleaned all the mirrors and glasses. In the photo on the left before cleaning and on the right after cleaning. Then he cleaned it again. But the best was gone. How else can you improve the quality? And why does the resin adhere strongly to the bottom of the tank? When the top moves off the platform you can hear it clinging to the bottom, once a piece of silicone (the bottom of the tank) fell off together with the part. Still due to the fact that 4 blocks stick to the bottom of the tank during an optical test, they fall off the platform. Here are photos at different heights falling off


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