Three-element course of automobile hanging bottle cleaning?

Three elements of automobile bottle washing course: 1. When the car is hot, it must be cleaned when the engine is running smoothly, and the low temperature will affect the cleaning effect; 2. Insert the injection needle of the infusion set and the injection needle of the air inlet pipe into the bottle side by side from the bottle mouth, and hang upside down or put aside the ternary cleaning agent; 3. When cleaning, the engine speed should be controlled at 1500 rpm (I didn't have any tools to keep the throttle turning at that time, so it was idle cleaning). Theoretically, there are instructions that idling or too low speed will cause liquid accumulation and damage to the engine (but I consulted Taobao sellers and said it was idling cleaning. I don't think this should be so strict); 4. Before inserting the infusion needle (tube) into the rubber intake vacuum tube of the engine (the vacuum tube I used was behind the throttle, which should be a carbon canister), I asked a lot of questions about the vacuum tube in the forum. At the same time, I consulted the literature. It is best to choose the intake vacuum tube near the middle of the air inlet to facilitate the uniform dispersion of the cleaning agent, so I determined the vacuum tube port behind the throttle.