spray for weeds in lawn

[Dr.wasif]

i have 4-5 different weeds both broad leaves and long leaves in my lawn and in good quantity which cant be manually removed...i went to a well reputed seeds store few days back and asked for weed spray and the guy gave me spray bottle for Rs.800 by the name of NOVEL BIOSCIENCES and it had these drugs bromoxynil+MCPA...he told me to water the lawn and then spray it on lawn and then after 24 hours water again.. and water daily afterwards for 5 days and after 5 days the weeds will die..regarding watering he said if u dont water ur grass will also die...now 15 days have passed but weed hasnt died..i want expert opinion regarding this spray?? was there any issue with the spray procedure or the spray wasnt good and better recomendations

[newton]

What is the weed you are trying to remove and what sort of condition is the rest of your lawn currently in.

A picture is worth a thousand words I'm sure we would be able to point you in the right direction