Is this safe with plastic/polymer?

Depending on the age it might look ashy. I tossed the grip from a gen 3 S&W with the gun separately and they curled up slightly. I was able to get them back to a decent shape with hoppes. Temperature may be the key element for polymer from what I take, I never went past 64°c

Can I drop my whole gun in there?

Yes, you can drop your whole gun in there. I wouldn't do that, but you can. I've found it best to break the gun down and then put it in the solution in order to get the best cleaning possible.

Can I use it for gold jewelry??

I did on spouses wedding/engagement rings. Clean debris of quickly. Saw no adverse effect on stones or metal. Did the same thing on her turquoise and silver brooches. Clean them right up too

ASIN	B00NVOPHKU
Best Sellers Rank	#60,336 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #774 in Commercial Cleaning Chemicals #2,263 in All-Purpose Household Cleaners
Brand Name	Shooter's Choice
Date First Available	September 24, 2014
Included Components	Ultrasonic Cleaning Solution (1 gal plastic jug)
Item Dimensions LxWxH	10 x 4.5 x 13 inches
Item Package Dimensions L x W x H	12.91 x 8.27 x 4.13 inches
Manufacturer	Otis Technology
Material	Blend
Model Name	SHF-UCS128
Number of Items	1
Package Weight	3.98 Kilograms
Part Number	SHF-UCS128
Size	128 Fl Oz (Pack of 1)
Style	Ultrasonic Solution (1 Gallon)
Suggested Users	unisex-adult
Warranty Description	No Nonsense

Ultrasonic Cleaning Solution (Select Your Style)

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