Kwalbar ruwa ta cika da ruwan gilashin, wanda ake amfani da shi don tsaftace iska na motar. Ruwan gilashi yana cikin kayan aikin motoci. Babban ruwa mai inganci ya ƙunshi ruwa, barasa, Ethylene glycol, lalata lalata lalata da iri-iri. Ana kiran ruwa mai iska na mota na mota kamar ruwan gilashi.