You can create price alert here, copy coupons and view price history. What is best price?
Car cleaning gun for helping you clean the automotive interior trim quickly, Large-capacity bottle for containing enough liquid detergent, Equipped with a brush, easy to clean narrow gaps in your car, Made of ABS and aluminum alloy material, anti-rust and sturdy, Wide handle, fitting your hands comfortably, Working pressure: 6 – 9.2kg, Operating temperature: 10 – 40℃
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($17.42): AM15prime
2. ($18.03): BgAuMotor
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 4a8254, 27183c, 502C6B, b37af8
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for High Pressure Car Interior Cleaning Gun.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).