Shower control problems

[Skater4fun]

I have two problems:

One is a Grohe shower only control. It has a lever handle behind the knob handle it is close to the escutcheon. The front handle is a round knob type control. Both controls function as designed except for one thing the lever handle that controls the volume of water is very hard to turn. This is a shower that doesn’t get much use so I am thinking that disassembling, cleaning and lubing with white grease might do the trick.
The only thing that gives me caution is the last time I tried to fix a small drip in a Grohe Tub/Shower Control I embarrassed myself in front of the customer by not being able to take the darn thing apart.

Number two is more mundane a Delta shower only control. Me thinks it is a 1300 series. The hot water takes an unusually long time to come up compared to the nearby sink and the flow is very low. I still have to see if it’s the fancy one with temp and pressure or just the plain vanilla one however changing the cartridge should do the trick, yes??

 

[Jadnashua]

I'd use the silicone plumber's grease rather than white lithium (but then again, I'm not a pro). If you know the model number, Grohe has parts breakdowns on their website. Is that grease listed for use on a potable water system?

 

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[elvisclock]

You never wnat the customer around when taking apart a Grohe valve. Some times you "gotta do what you gotta do" to get them apart.