What do I use and how do I lubricate the stiff focussing knob on my Zip Focus 10X50 tasco binocs?

SOURCE: my lens is out on my tasco 10x50 mm zip focus 2023 brz wideangle

Crazy glue will sometimes leave a white cloudy film on the glass surface. I've had good luck with www.binocularservice.com and they are very reasonable too.

SOURCE: Stiff focussing wheel on Zeiss binoculars

like me and you with age we all get stiff...sounds like it has been used alot and needs regreasing. the focus wheel on the zeiss is a double washer type and that it why it is stiff, sometimes the washer between the two focus knobs gets broken....but im sure thats not it...just needs a little tlc ..if i can help any further give me a call @15082549726....surprised zeissman didnt answer thi

SOURCE: The adjustment knob was very hard to turn. Any way to lubricate?

I would be inclined to use a penatrative aerosol lubricant (like WD-40) in very sparse quantities. Squirt a little in using the WD40 smart straw applicator to direct the lube accurately and work the adjuster back and forth in a small section. Repeat this until you have freed up the adjustment from one end of its scope to the other. The focal adjustment is typically housed separately to the lenses and careful application of the lube should not affect them - avoid overusing the lube and have a mopup cloth under the spray zone to keep overspray/drips to an absolute minimum.

SOURCE: My Tasco 10x50 InFocus Binoculars

This is normal I'm afraid. "InFocus" is a brand name indicating that these are fixed focus. The name implies that they are magically always in focus, but actually means that they CAN'T be focussed. They have a fixed compromise focus setting that is OK but maybe not brilliant from far distance to fairly close, but actually only completely right at some point in between. If you want binoculars to use for much closer viewing than the compromise distance, you need to buy some with a focussing knob.