Never squeeze a partial or full lower as you will brake them unless they are the flexi ones when you clean them. As for soaking them half a hour in a sterile liquid or tab disolved in warm water is long enough as it attacks the acrylic. Just plain tap water in a denture bath or glass is fine for over night. If you have a chrome read the steri info as some turn the chrome black a quick dip will suffice. You can always contact a local technician for a re polish and help in cleaning.
Never use toothpaste to clean a denture! Its is abrasive and takes the shine of the acrylic, I make dental prosthetics and know what toothpaste does to them after 23 years in the job. You wont have a model to place your dentures on so you may find they pop out of your hands when they are wet. Fill the sink with water to act as a cussion if you drop them so they have less chance of being fractured, hold A edge in the forefinger and thumb. Rinse food stuff off and use a soft tooth brush.
YOU ABSOLUTELY DO NOT BRUSH DENTURES WITH A REGULAR TOOTHBRUSH OR WITH REGULAR TOOTHPASTE!! A REGULAR TOOTH BRUSH IS TOO ROUGH AND REGULAR TOOTHPASTE IS ABRASIVE. YOU WILL SCRATCH AND DAMGE YOUR DENTURES. SOFT DENTURE BRUSH ONLY!! AND YOU CAN USE DAWN SOAP AND WATER TO BRUSH WITH!