While a clean environment is conducive for prayers, one wonders if respect means only removing or wearing external appendages. Respect for a sacred place should also mean adherence to teachings of holy books and traditions, which emphasise the importance of being virtuous. Respect will mean many more things if one imbibes these teachings and extends them to daily life. It would mean being honest, kind, courteous, considerate and empathetic. It would mean being calm, polite, accepting differences in beliefs, and accepting someone for what she is.
It would mean being willing to admit and learn from shortcomings, which implies high self-esteem. It would mean being tenacious and hardworking. And all this would mean that the world would be a better place. As it is said, you will also get respect once you give respect.