Canon EF 70-200mm f/4 L USM - how to clean the lens inside

This video is about cleaning the inside of the Canon EF 70-200mm f/4 L USM lens. The lens had dust behind the front lens element, so in this video the front lens element was removed, the inside of the lens was cleaned, then it was assembled.

UPDATES: n/a

TIMESTAMPS:
00:00 Intro
00:30 Tools
01:00 Like, sub, donate
01:31 Disassembly
06:09 Clean
08:34 Assembly
14:17 Outro

RELATED VIDEOS:
Cleaning lenses (playlist):    • Canon EF-S 15-85mm f/3.5-5.6 IS USM clean ...  
Canon EF 70-200mm f/4 L USM disassembly:    • Canon EF 70-200mm f/4 L USM disassembly  
Canon EF 70-200mm f/4 L USM assembly:    • Canon EF 70-200mm f/4 L USM assembly  

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TOOLS I USED (ebay /// aliexpress link):
PH000 screwdriver: http://ebay.us/Dz8nTA /// https://ali.ski/2e8ZaZ
Metal tweezers: http://ebay.us/jGp7JO /// https://ali.ski/g4VpW
Adjustable metal tweezers: http://ebay.us/yc3cbb /// https://ali.ski/k_elg
Wood screw: http://ebay.us/zty059 /// https://ali.ski/61n7G
Airpump: http://ebay.us/XPC6wo /// https://ali.ski/-Yc1r2
Lens cleaning fluid: http://ebay.us/WXS3GC /// https://ali.ski/MYvYl
Microfiber cloth: http://ebay.us/YpEifd /// https://ali.ski/6CzC7
Flashlight: http://ebay.us/1ouZGD /// https://ali.ski/lr1QH
Small brush: http://ebay.us/R54Rjh /// https://ali.ski/LEV6Sk
Permanent marker: http://ebay.us/GFUtke /// https://ali.ski/HOZKG
Lens opening tool: http://ebay.us/9pwDXk /// https://ali.ski/ObN0pb