Hey, Selmer, you Old Cheapskate!
I too recycle used plastic bottles for holding gun cleaning oils and solvents when in the field, truck, shooting range, etc. My favorites are the little complementary shampoo bottles that you get free from hotels.
HOWEVER, and this is a big "IF", I've had to learn the hard way that not all plastics are the same!
Many, if not most, plastic container products are made in China nowadays, and while this is not an indictment of low quality control, it IS a statement of their limited chemical industry and sophistication.
China used and sold corrosive small arms primers in their military and commercial ammunition throughout the 1980's and into the 1990's. Why? Because of an "it was always done that way" attitude, and because there was no pressure to transistion to modern non-corrosive primers until American shooters demanded it.
I've stored Breakfree CLP, Hoppes, and various other solvents and lubricants in several dozens of types of small plastic containers for the last several years. Many of them become swollen, soft, and leak like crazy at the cap area.
I asked the materials engineer at work and he stated that the most common ingredient that would do that (soften plastic bottles) is diesel and aircraft fuels, and other kerosene-type hydrocarbons. And YES, gun cleaning solvents are almost universal in their use of hydrocarbon solvents.
Apparently not all plastics are suitable for this use. I would test batches and containers periodically to avoid problems.