diff --git a/src/components/Modtools.jsx b/src/components/Modtools.jsx
index 0eec28c..8d94c09 100644
--- a/src/components/Modtools.jsx
+++ b/src/components/Modtools.jsx
@@ -7,6 +7,7 @@ import React, { useState, useEffect } from 'react';
 import { useSelector, shallowEqual } from 'react-redux';
 import { t } from 'ttag';
 
+import useInterval from './hooks/useInterval';
 import { getToday, dateToString } from '../core/utils';
 
 const keptState = {
@@ -277,6 +278,12 @@ function Modtools() {
     }
   }, []);
 
+  useInterval(() => {
+    if (userlvl > 0) {
+      getCleanerStats((stats) => setCleanerStats(stats));
+    }
+  }, 10000);
+
   const cleanerStatusString = (!cleanerstats.running)
     ? t`Status: Not running`
   // eslint-disable-next-line max-len
@@ -625,6 +632,14 @@ function Modtools() {
             tlccoords,
             brccoords,
             (ret) => {
+              setCleanerStats({
+                running: true,
+                percent: 'N/A',
+                method: cleanAction,
+                tl: tlccoords,
+                br: brccoords,
+                canvasId: selectedCanvas,
+              });
               setSubmitting(false);
               setResp(ret);
             },
diff --git a/src/components/hooks/useInterval.js b/src/components/hooks/useInterval.js
new file mode 100644
index 0000000..6fe50f6
--- /dev/null
+++ b/src/components/hooks/useInterval.js
@@ -0,0 +1,24 @@
+import { useEffect, useRef } from 'react';
+
+function useInterval(callback, delay) {
+  const savedCallback = useRef();
+
+  // Remember the latest callback.
+  useEffect(() => {
+    savedCallback.current = callback;
+  }, [callback]);
+
+  // Set up the interval.
+  // eslint-disable-next-line consistent-return
+  useEffect(() => {
+    function tick() {
+      savedCallback.current();
+    }
+    if (delay !== null) {
+      const id = setInterval(tick, delay);
+      return () => clearInterval(id);
+    }
+  }, [delay]);
+}
+
+export default useInterval;
diff --git a/src/core/CanvasCleaner.js b/src/core/CanvasCleaner.js
index 87f75de..b53ac1a 100644
--- a/src/core/CanvasCleaner.js
+++ b/src/core/CanvasCleaner.js
@@ -28,24 +28,24 @@ const METHODS = {
    *   of chunk area
    */
   spare: (xc, yc, clrIgnore, canvasCleaner) => {
+    let pxl = canvasCleaner.getPixelInChunkArea(xc, yc);
+    if (pxl === null || pxl < clrIgnore) {
+      return null;
+    }
     let rplPxl = null;
     for (let u = -1; u <= 1; u += 1) {
       for (let v = -1; v <= 1; v += 1) {
-        const pxl = canvasCleaner.getPixelInChunkArea(xc + u, yc + v);
-        if (pxl === null) {
+        pxl = canvasCleaner.getPixelInChunkArea(xc + u, yc + v);
+        if (pxl === null
+          || (u === 0 && v === 0)
+        ) {
           continue;
         }
-        if (u === 0 && v === 0) {
-          if (pxl < clrIgnore) {
-            return null;
-          }
-        } else {
-          if (pxl >= clrIgnore) {
-            return null;
-          }
-          if (rplPxl === null) {
-            rplPxl = pxl;
-          }
+        if (pxl >= clrIgnore) {
+          return null;
+        }
+        if (rplPxl === null) {
+          rplPxl = pxl;
         }
       }
     }
@@ -53,32 +53,33 @@ const METHODS = {
   },
 
   spareext: (xc, yc, clrIgnore, canvasCleaner) => {
+    let pxl = canvasCleaner.getPixelInChunkArea(xc, yc);
+    if (pxl === null || pxl < clrIgnore) {
+      return null;
+    }
     let rplPxl = null;
-    let origPxl = null;
+    const origPxl = pxl;
     for (let u = -1; u <= 1; u += 1) {
       for (let v = -1; v <= 1; v += 1) {
-        const pxl = canvasCleaner.getPixelInChunkArea(xc + u, yc + v);
-        if (pxl === null) {
+        pxl = canvasCleaner.getPixelInChunkArea(xc + u, yc + v);
+        if (pxl === null
+          || (u === 0 && v === 0)
+        ) {
           continue;
         }
-        if (u === 0 && v === 0) {
-          if (pxl < clrIgnore || pxl === rplPxl) {
-            return null;
-          }
-          origPxl = pxl;
-        } else {
-          if (rplPxl === null) {
-            rplPxl = pxl;
-          }
-          if (pxl >= clrIgnore) {
-            if (rplPxl < clrIgnore) {
-              rplPxl = pxl;
-              continue;
-            }
-            if (pxl !== rplPxl) {
-              return null;
-            }
-          }
+        if (rplPxl === null) {
+          rplPxl = pxl;
+          continue;
+        }
+        if (pxl < clrIgnore) {
+          continue;
+        }
+        if (rplPxl < clrIgnore) {
+          rplPxl = pxl;
+          continue;
+        }
+        if (pxl !== rplPxl) {
+          return null;
         }
       }
     }