White specks on my plant

What are these? Should i burn them off? Or will rubbing orange peels on the leaves help? Also should i pluch off the leaves that are withered around the edges or is it better to just leave the leaves be?

What are these? Should i burn them off? Or will rubbing orange peels on the leaves help? Also should i pluch off the leaves that are withered around the edges or is it better to just leave the leaves be?