Bottles not spraying

I've been buying shield car products since i got my car. This is unfortunately the second time that i bought the tyre gloss and the sheen xtreme big bottle that it's still halve full but it won't spray properly anymore. I bought the whole kit the first time with the cloths and everything was perfect, it's just sad that this happened now. I do hope you could find a solution for me as i don't have the till slips anymore didn't think i would need it.