Hi there Mervin,
Yep, I with Kelo -- looks like mite damage.
I like to use isopropy alcohol 70% with 50 mix of distilled water. You can use a smallish paint brush and paint down all leaves, front and back. If you have awater bottle handy you can also spray you're plant down. Repeat in 5 days. It works really well the first time alone with adults & eggs. Besure to go over it again just incase you missed anything.
I use this method on all my orchids with no damage to the leaves.
Good luck