AT&T, primarily known for its telecommunications services, does not directly provide a service for sending ink or toner cartridges for printers as part of its business operations. Their focus is on internet services, wireless communications, digital television, and related products rather than office supplies or printer accessories. If you're looking for a subscription service for ink or toner, you might want to consider manufacturers' services like HP’s Instant Ink, which sends new ink cartridges based on your printer's usage for a monthly fee. Alternatively, office supply stores and online retailers offer ink delivery services that might suit your needs.

Identifying polypropylene (PP) among plastics can be done through several methods. Primarily, look for the resin identification code, a triangle of arrows with a number inside it on the product. Polypropylene is indicated by the number "5." If the code is not present, a burn test can be performed in a safe, well-ventilated area: PP burns and drips like candle wax and produces a faint paraffin-like odor. It's important to note that this test should be done with caution to avoid burns or fire. Another method is the density test, as PP floats in water due to its density being less than 1 g/cm³, distinguishing it from other plastics such as PET (polyethylene terephthalate) which sinks. Remember, safety precautions are critical while conducting these tests.

Cleaning inkjet printer rollers is crucial for maintaining print quality and preventing paper jams. Firstly, turn off and unplug your printer for safety. Access the rollers by opening the printer's access panel or door. Prepare a lint-free cloth dampened with distilled water or isopropyl alcohol for more effective cleaning. Carefully wipe the rollers, rotating them gently to clean the entire surface. Avoid using excessive liquid to prevent damage. Once clean, allow the rollers to dry completely before reassembling and turning on the printer. Avoid touching the rollers with your fingers to prevent oil transfer. Regular cleaning, depending on printer usage, will prolong the life of your device and ensure consistent print quality.