A clean coverslip will help cell adhesion and enhance polyamino acids coating.
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Make 1M HCl in a glass container and put coverslips in it.
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Heat the acid to 50-60 °C for 4-16 hours with occasional agitation.
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Wash the coverslips extensively in distilled water (two times), then double distilled water (two times). Be sure to wash out the acid between sticked coverslips.
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Rinse coverslips in 100% ethanol and dry them between sheets of whatman filter paper.
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Keep coverslip in a clean container.