RESTORED Yellow Plastic Brake Reservoir - Vintage Porsche 911

I tried three methods to renew my yellow aged brake reservoir to clear white with decent results, but not like the video below:
https://youtu.be/JqCN7VHMtfQ
Method #1 was Sulfamic Acid H3NSO3 just like the video above.
My hunch is that this works best for rust stains, but not yellow due to age

Method #2 was Hydrogen Peroxide & Oxy-Clean which didn't do anything. I did try it outside in direct sunlight too.

Method #3 was abrasive Comet and a Grey Scotch-brite pad. This worked ok, but I believe the plastic on my 50 year old reservoir is yellow all the way through
Materials:
H3NSO3 on ebay:
https://rover.ebay.com/rover/1/711-53200-19255-0/1?mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FSulfamic-Acid-H3NSO3-99-ACS-Grade-Powder-4-Oz-in-a-Space-Saver-Bottle-USA%2F222030079773%3Fhash%3Ditem33b206271d%3Ag%3ATt8AAOSwhcJWQam3&campid=5338270888&toolid=10001&customid=

3% Hydrogen Peroxide available at CVS Drug Store or amazon:
https://amzn.to/3mYNnVK

Grey Scotchbrite
https://amzn.to/2HwQfIZ
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Below is a table of contents of past episodes 1-35. Click the link below for the rest
www.ahhgaragetime.com/TOC

Intro
Stripped Shell Introduction
https://youtu.be/1Z7Jm7HLQmg

1
Drivers Fender Backdate, Unfold short hood edge, Make Signal Box Parts From Flat Sheet
https://youtu.be/Dt-QB1vDuQQ

2
Drivers Fender Signal Box, Shape Bottom Portion w/ Bead Roller
https://youtu.be/qI6Jj14psUs

3
Drivers Fender Side Patch Panel Hammerform, TIG Weld Signal Housing
https://youtu.be/YAhsOyKi-qg

4
Drivers Fender TIG Weld Side Patch Panel, Add signal housing triangle piece
https://youtu.be/6FXdx6kbFtk

5
Passenger Side Fender Backdate, Additional Content From Driver's Side
https://youtu.be/TV_JqDXP0qA

6
Shorthood to Longhood Conversion, Form Outer Skin Edges And Weld On
https://youtu.be/GJvClolyh4Q

7
E Wheel and Form Longhood Inner Skin w/ Handormed Strength Rib
https://youtu.be/b9PtEoh8xoA

8
TIG Weld Outer and Inner Longhood Extension
https://youtu.be/GkpAp_jls0E

9
Longhood Front Seal Custom Bracket
https://youtu.be/49i-WCkMOCw

10
Rear Backdate, Remove Rear Impact Bumper and Valence
https://youtu.be/FiI65ZN7AGs

11
Lead Rear Valence Corners, Rear Latch Panel Backdate
https://youtu.be/1HLIKrwI9-0

12
Hybrid Steel License Plate panel & Fiberglass Rear Bumper, Custom Panel Brackets
https://youtu.be/FfJgTVLin6s

13
Custom Aluminum Rear Bumperettes, Solidworks Design, Cut on CNC machine, Rear Flare Trial Fit
https://youtu.be/-Cy4XhKmawU

14
Form and TIG Weld Custom Rear Aluminum Bumperettes, Rear Bumper Complete
https://youtu.be/-Cy4XhKmawU

15
SC to RS Flare Comparison, Photoshop & Sheetmetal Conversion to RS
https://youtu.be/XFu2nSJ9Pos

16
Tack Weld Passenger Side RS Rear Flare, Remove Undercoat, Align Flare
https://youtu.be/0-n4tyIfgsw

17
Weld Passenger Side Flare, TIG VS MIG, Planishing, Weld Distortion, TIG Arc shots
https://youtu.be/t2xomaxWhFc

18
Align Body Panels, Hood gaps, Adjust tub with dumbell, Repair Rocker, gap tool, Windshield fit check
https://youtu.be/6yWs9XshwOE

19
Fill 20+ Holes, Mirror, Washer Jets, Rockers, Gas Filler, Antenna,
https://youtu.be/-zsdmKKBBxc

20
Remove Rear Window without cutting seal, Kick Method
https://youtu.be/gb6fcoNMcjQ

21
Remove Decklid Bumps and adjust Gaps & Fit, Add Weld material to edge
https://youtu.be/xvqSVX80zJM

22
Weld Pssgr Fender Support Panel, Lead Hood to Fender Gap, Weld Fender Edge to Reduce Gap
https://youtu.be/ja6NWEv1h88

23
Build quality, Improve Panel Fit, Lead Passenger Door Gap, Lead Rocker to fender gap, Drivers Door
https://youtu.be/Tl3BLMtuYBQ

24
Drivers Door Alignment, Fill Rust Pits with TIG, Lead Drivers Door Gap, Adjust Front Fender Signal Fit,
https://youtu.be/y1Ty8GZcRuw

25
Discovered Rust in Suspension Pan, Spot Weld Drilling, Tram Guage Mounting Points, cut out pan
https://youtu.be/RHk3--W7V0w

26
Suspension Pan Repair, remove suspension, Cut Latch Panel for Oil Cooler, Check Squareness
https://youtu.be/5Prp3qBijiw

27
Align and Weld Suspension Pan, Spirit Level to remove twist, Kettle Bell Hits to Tweak Position, Rosette Welds
https://youtu.be/VkPx2kQlIb4
35
Rear Coilover Gussetts & X-member strengthening plates, Golf Ball Dimple Dies For Speed Holes,
https://youtu.be/OvwP5Iy0864

Видео RESTORED Yellow Plastic Brake Reservoir - Vintage Porsche 911 канала Garage Time - DIY Porsche Restoration