Car Washer Bottle Smell

Smells like rotting sewer water.
Car washer bottle smell. The cause well the windshield wash. Smelly screen wash water. Is there anything else i can put in that won t destroy my windshield washer pump and or hoses. Inside the reservoir is a pump that circulates washer fluid through plastic lines to the washer nozzles and then sprays evenly onto your windshield when the system is activated by the driver.
Sounds like the last owner of the car did not use screen wash in the windscreen washer bottle. I put this down to the screen wash bottle. The screen washer fluid in my vw touareg smells dreadful. My mk4 escort has it s air intake further forward in the bonnet as do a lot of other older cars.
Presumable it s because the cabin air intake is right at the base of the windscreen where all the fluid can seep down and evaporate into the car. Hi what s has bugged me for a while now is why do particularly newer cars smell of windscreen washer when you operate the jets. But whatever it is i dont want to risk the paintwork. The best this to do is fill the washer bottle with just boiled water let it fill almost to the top and then fill to the top with screen wash.
I have tried adding. When a windshield washer reservoir breaks or is damaged there will be several symptoms or warning signs that will alert you to this problem. Rover 600 6 years old. It smells like something has died in there.
What is recommended for removing the smell i ve thought about adding some milton sterilising fluid or some steradent. It smelled like fish it also smelled like poop and throw up at different times. I was driving it at the weekend on a motorway with the aircon off fan off when i used the screen wash a few seconds afterwards a horrible smell of stagnant water came into the car. If tap water is used over time the water will go off and stink every time you use the sprayer.
Fresh biodegradable solvent hint of ammonia fresh cold weather solvent methyl alcohol bleach apple cider vinegar. Bad smell coming from the car ac vents.