An experienced gardener have found for cleaning off the plant “sap” that accumulates on blade tips, soaking them for a few minutes in a little shot type glass with about an inch of olive oil in it then wiping them off on paper towels works very well rather than scraping with a blade or using alcohol.
https://www.amazon.com/VIVOSUN-Gardening-Pruning-Titanium-Precision/dp/B06Y1XVD1P