The prime thing is to remove the food for Lizard, ie. other small insects. Those insects can be removed by using insect killing sprays , granule insecticides and pastes. These are available common. If you are averse to kill lizards, drive out the lizard by a smooth brush, spraying water or shoo...shooing, Then remove all the cobwebs and remove all the clutter and dirt. Then use the multipurpose insect spray to kill the small insects. Take normal precautions for using the spray.
Wait for sufficient time till the insects are killed and/or driven out.Clean the whole place especially the corners,; seal any small ant hole, crack etc on walls and floor corners. Paint or colour wash or white wash the walls and monitor keep the wall space space without any cobwebs. Remove any cobweb forming immediately then and there. Do not give room for insects and flies to visit the place again. You can keep chemical deodorants, Camphor or some other materials which give pleasant odour also.
You may have to repeat use of insect sprays periodically if you spot insects again. You can get rid of Lizard menace also by this.
Electronic insect repellents can be useful, but not to the expected level. They are not effective on small flying insects.