When choosing a drain cleaner for PVC pipes, it's crucial to avoid chemical solutions that can damage or weaken the pipe material. Enzymatic drain cleaners are generally the safest option for PVC pipes. These types of cleaners use natural bacteria or enzymes to break down organic material causing the blockage in the drain, such as hair, grease, or food particles, without the corrosive effects of chemicals. Brands like Bio-Clean and Green Gobbler offer effective enzymatic solutions that are safe for regular use in homes with PVC piping systems. It's important to follow the manufacturer's directions for use and give the product sufficient time to work, often overnight, for the best results.

Motor oil is a lubricant used in internal combustion engines, which are found in vehicles, motorcycles, and various types of machinery. Its primary function is to lubricate the engine parts, reducing friction and wear, and helping to cool the engine by carrying heat away from moving parts. Additionally, motor oil serves to protect against corrosion, keep the engine clean by suspending dirt particles, and improve sealing. It is available in different viscosities and types such as conventional, synthetic, and synthetic blends, each designed to meet specific requirements and operating conditions. The choice of motor oil depends on the vehicle manufacturer's recommendations, climate, and the engine's mileage and condition. Regular oil changes are crucial for maintaining engine health and performance.

I'm sorry, but I don't have real-time or future-specific updates regarding the return of "Best Ink" or similar shows. As of my last update, "Best Ink" was a reality TV competition that searched for the best tattoo artists, airing its final, third season in 2013. Regarding its comeback, without current updates, it's uncertain whether networks have plans to revive it or create a similar format in the future. The landscape of television and streaming services is always evolving, with a growing interest in niche and specialized content, including tattoo-related programming. Fans of the genre should keep an eye on announcements from networks that have previously aired similar content, like Oxygen, or streaming platforms that are continually expanding their reality show offerings. Additionally, social media platforms and press releases from production companies involved in reality TV production might be good sources for any news on a revival or new shows focusing on tattoo artistry.